When aluminum magnesium alloy dust floats in the air, a certain ignition energy can easily cause an accidental explosion. To prevent and control the occurrence of accidental explosions and reduce the severity of accidents, it is necessary to carry out research on the explosion suppression of aluminum magnesium alloy dust. This paper uses a vertical glass tube experimental device and a 20 L spherical explosive experimental device to carry out experimental studies on the suppression of the flame propagation and explosion overpressure of aluminum magnesium alloy dust with melamine polyphosphate (MPP) and Al(OH)₃. With increasing MPP and Al(OH)₃ concentrations, the flame brightness darkened, the flame velocity and propagation distance gradually decreased, and P_max and (dp/dt)_max decreased significantly. When the amount of MPP added reached 60%, the flame propagation distance decreased to 188 mm, which is a decrease of 68%, and the explosion overpressure decreased to 0.014 MPa, effectively suppressing the explosion of aluminum magnesium alloy dust. The experimental results showed that MPP was more effective than Al(OH)₃ in inhibiting the flame propagation and explosion overpressure of the aluminum magnesium alloy dust. Finally, the inhibitory mechanisms of the MPP and Al(OH)₃ were further investigated. The MPP and Al(OH)₃ endothermic decomposition produced an inert gas, diluted the oxygen concentration and trapped active radicals to terminate the combustion chain reaction.

当铝镁合金粉尘漂浮在空气中时，一定的点火能量很容易引起意外爆炸。为了防止和控制事故性爆炸的发生并降低事故的严重性，有必要进行铝镁合金粉尘的爆炸抑制研究。本文采用立式玻璃管实验装置和20 L球形爆炸实验装置进行了三聚氰胺多磷酸盐（MPP）和Al（OH）₃抑制铝镁合金粉尘的火焰传播和爆炸超压的实验研究。随着MPP和Al（OH）₃浓度的增加，火焰亮度变暗，火焰速度和传播距离逐渐降低，P _max和（dp / dt）_max明显降低。当MPP的添加量达到60％时，火焰传播距离减少到188 mm，减少了68％，爆炸超压降低到0.014 MPa，有效地抑制了铝镁合金粉尘的爆炸。实验结果表明，MPP在抑制铝镁合金粉尘的火焰传播和爆炸超压方面比Al（OH）₃更有效。最后，进一步研究了MPP和Al（OH）₃的抑制机理。MPP和Al（OH）_3的吸热分解产生惰性气体，稀释了氧气的浓度并捕获了活性自由基，从而终止了燃烧链反应。